GPM Racing 4140 Carbon Steel + 7075 Alloy Front & Rear Differential Gear Set 12/30T for Arrma 1/18 Granite Grom (MGG1230FRS)
We are the importer of record — the price you see is the price you pay.
Handled by us in the UK under the Consumer Rights Act — no sending it overseas.
What our customers say
A selection of recent five-star reviews, as written.
-
★★★★★
Ordered flishrc cobra. Communication was great. Ordered larger batteries but they were the wrong size. Olly shipped the right batteries and gave a refund for the difference I paid. Couldn't ask for more. Thanks for the help with the order.
Robert, 22 September 2026
-
★★★★★
Very helpful when the vehicle I wanted wasn't in stock. Very fast deliver too.
Anna Abbott, 17 September 2026
-
★★★★★
Excellent service speedy delivery and good customer service
GLYN, 10 September 2026
-
★★★★★
Great product and service. I enjoy buying from these guys. Thanks to radio-controllled.co.uk.
Paul Jordan, 3 September 2026
-
★★★★★
Dealt with customer services over an order I accidently placed, they were prompt and dealt with it will, completely refunded within a small window of time, thanks!
Oliver Galustian, 23 July 2026
-
★★★★★
Really good online rc store with some great products and sales on. The owner is very knowledgeable as well.
Simon, 19 July 2026
-
★★★★★
Product delivered promptly and in excellent condition 👍had very helpful and prompt responses from Olly to all my questions, I will definitely be using them again 👍
Mark Clucas, 30 January 2026
-
★★★★★
The customer service and advice were first class!
Steve Avery, 9 September 2025
-
★★★★★
The seller knew I was after one and very kindly informed me when they came back into stock so now have a Flywing Bell 206. Fantastic bit of kit. Well worth the wait.
Pete Goddard, 15 April 2025
-
★★★★★
Great service, car arrived fast and really well packaged. Also, I had a little problem....(which turned out to be me doing it wrong) but someone replied the same evening! Will definitely be buying from them again.
Graham Rousseau, 10 February 2025
Key Specs
- Scale
- 1/18
- Weight
- 66 g
About this product
Technical overview of the GPM MGG1230FRS differential for ARRMA GRANITE
This GPM differential assembly is constructed with 4140 carbon alloy steel gear components and 7075-T6 aluminium alloy housings to emphasise durability and consistent meshing under load. The spiral cut ring gear helps reduce shock loads during torque transfer. Critical drive gears include a 30T large bevel and a 12T front bevel that have been surface hardened to improve wear resistance in high-load scenarios. The unit is fully assembled with bearings and installs as a direct replacement for factory parts (#ARA311193 + #ARA311182). Differential oil is not included; follow ARRMA manual guidance for oil selection and fill technique.
Packing includes
- MGG1230FS Front Complete Differential – 1PCS
- Front Pinion Gear 12T – 1PCS
- MGG1230RS Rear Complete Differential – 1PCS
- Rear Pinion Gear 12T – 1PCS
Original Name / Part No:
- ARA311193+ARA311182
Compatible Models
- ARRMA 1/18 4WD GRANITE GROM MEGA 380 BRUSHED 4X4 MONSTER TRUCK-ARA2102
- ARRMA 1/14 TYPHON GROM MEGA 380 BRUSHED 4X4 SMALL SCALE BUGGY RTR-ARA2106
- ARRMA 1/16 MOJAVE GROM MEGA 380 BRUSHED 4X4 SMALL SCALE DESERT TRUCK RTR-ARA2104
- ARRMA 1/16 MOJAVE GROM 223S DSC 4X4 RTR BRUSHLESS DESERT TRUCK-ARA2304
- ARRMA 1/16 MOJAVE GROM 223S DSC 4X4 RTR BRUSHLESS DESERT TRUCK-ARA2304S
- ARRMA 1/14 TYPHON GROM 223S DSC 4X4 RTR BRUSHLESS BUGGY-ARA2306S
- ARRMA 1/14 TYPHON GROM 223S DSC 4X4 RTR BRUSHLESS BUGGY-ARA2306
- LOSI 1/12 NASCAR RC Racecar Ryan Blaney No. 12 2024 Menards Ford Mustang 2S AWD RTR Brushed On-Road-LOS1122412
- LOSI 1/12 NASCAR RC Racecar Chase Elliott No. 9 2024 NAPA Chevrolet ZL1 Camaro 2S AWD RTR Brushed On-Road-LOS1122409
- LOSI 1/12 NASCAR RC Racecar Kyle Larson No. 5 2024 HendrickCars.com Chevrolet ZL1 Camaro 2S AWD RTR Brushed On-Road-LOS1122405
- ARRMA 1/16 QUAKE GROM 4X4 RTR Brushed Monster Truck-ARA2137
- ARRMA 1/16 GORGON GROM 4X4 RTR Brushed Monster Truck-ARA2130
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Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.
What our customers say
A selection of recent five-star reviews, as written.
-
★★★★★
Ordered flishrc cobra. Communication was great. Ordered larger batteries but they were the wrong size. Olly shipped the right batteries and gave a refund for the difference I paid. Couldn't ask for more. Thanks for the help with the order.
Robert, 22 September 2026
-
★★★★★
Very helpful when the vehicle I wanted wasn't in stock. Very fast deliver too.
Anna Abbott, 17 September 2026
-
★★★★★
Excellent service speedy delivery and good customer service
GLYN, 10 September 2026
-
★★★★★
Great product and service. I enjoy buying from these guys. Thanks to radio-controllled.co.uk.
Paul Jordan, 3 September 2026
-
★★★★★
Dealt with customer services over an order I accidently placed, they were prompt and dealt with it will, completely refunded within a small window of time, thanks!
Oliver Galustian, 23 July 2026
-
★★★★★
Really good online rc store with some great products and sales on. The owner is very knowledgeable as well.
Simon, 19 July 2026
-
★★★★★
Product delivered promptly and in excellent condition 👍had very helpful and prompt responses from Olly to all my questions, I will definitely be using them again 👍
Mark Clucas, 30 January 2026
-
★★★★★
The customer service and advice were first class!
Steve Avery, 9 September 2025
-
★★★★★
The seller knew I was after one and very kindly informed me when they came back into stock so now have a Flywing Bell 206. Fantastic bit of kit. Well worth the wait.
Pete Goddard, 15 April 2025
-
★★★★★
Great service, car arrived fast and really well packaged. Also, I had a little problem....(which turned out to be me doing it wrong) but someone replied the same evening! Will definitely be buying from them again.
Graham Rousseau, 10 February 2025
